Ok, that makes more sense. In your script, just have an #if statement to check if there is a value. If not, you can output your default...
Great thank you! The only thing I couldn't do was get a different default value to pull in when I placed this in two different places, but I guess I can just make another token. This is what I ended up with in the Script Token:
#if ($lead.Potential_Contribution_Margin__c.toString().length() eq 0)
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Your Currency field is already a string in Velocity. You should just need $lead.Potential_Contribution_Margin__c.isEmpty().